Internal circulatory heater



Aug. 6, 1940- P. R. MONAMAR l INTERNAL CIRCULATORY HEATER Filed Feb. 9, 1939 `'2 Sheets-Sheet 1 Pw .....N

P R. Ma/'amar Aug. 6, 194o.`

P. R. MCNAMAR INTERNAL CIRCULATORY HEATER Filed Feb. 9, 1939 2 Sheets-Sheet 2 .W4 llilllllllllltlln ,lllllllulwlli MEE Patented Aug. 6, 1940 UNITED STATES INTERNAL CIRCULATORY HEATER lPaulR. McNamar, Garden City, Iowa Application February 9, 1939,"Seria1No. 255,501

v Claims.

This invention relates to an improved hot air stoveor furnace. v

It is an object of this invention to provide an improved hot air heater having an inner casing 5@ for heating air and an outer jacket spaced from said inner casing and provided with means for conveying the products of combustion by an inclined ascending route around said inner casing for heating the air contained therein.

Another object of the invention, is to provide automatic means for controlling t'he supply of fuel to said heater for maintaining a predetermined temperature therein; and means for automatically and ladjustaloly controlling the release of the combustion gases for obtaining the maX- imum of heat radiation therefrom.

Still a further object of the invention, is toprovide a plurality of burners so disposed relatively to the inner air chamber and to its inlets d that thel air passing into said chamber and in the bottom thereof will be ldirectly heatedby said burners in cooperation with the yinclined ascending passages for heating the air as it passes upwardly through said heating chamber.

Other objects and advantages of the invention will hereinafter become more fully apparent from the following description of the drawings, which illustrate a preferred form thereof, and

wherein: j v

Figure 1 is a side elevational view partly in section of a furnace or stove constructed in accordance with the invention,

Figure 2 is a vertical sectional view taken on the line 2-2 of Figure 1,

Figures 3, 4 and 5 are horizontal sectional views taken on the lines3-3, 4 4 and 5 5, respectively of Figure 2, and

Figure 6 is a vertical central sectional view taken on the line 6-6 of Figure 4.

Referring more particularly to the drawings, wherein like reference characters designate like [or correspondingparts throughout the different views, I0 designates generally the heater which may be either astove or furnace and which includes the outer casing or jacket designated generally I I having the legs I2 at its lower end forming the spaces I3 through which air is adapted to circulate. The outerk casing IIk is provided with a horizontal partition I4 adjacent its top and with a rounded top forming withsaid partition the dome I5.

` Mounted within the casinglI and in spaced relationship to its side walls and to its partition I4 is an inner casing I6 Aprovided with the four depending pipes or conduits I'I which open outwardly at their lower ends and which are disposed in spaced apart relationship relatively to each other. As best seen in Figure 4, the side walls of the two casings II and I6 are disposed so that the adjacent walls of each casing are sl5- substantially parallel to each other inasmuch as the two casing are of substantially the same cross sectional shape. As illustrated, the heater I0 is rectangular in shape, but it is to 'be understood that it could likewise be of circular formif 10 desired. Casing I6 at its top is provided with the upwardly extending passages I8 whichextend through the partition Ilito communicate with the dome. I5 adjacent its opposite ends. Between the inner and outer casings I6 and l5 I i, respectively, are provided the continuous ascending vanes I9 which extend the length of the inner casing I6 to form the rectangular ascending passages 20 which extend frornthe space 2| below the casing I6 to the space 22 be- '20 tween the casing I6 and the partition I4. Y

Extending from the front through "the rear of the dome I5 are the spaced parallel partitions 23 forming therebetween the draft passage 24 which communicates with the space 22 by means 25 of the opening 25 formed in the partition I4. The rear portion of the draft passage 24 which extends beyond the` rear Wall of the casing II is provided with an annular flanged opening 2t at itst'op adapted to connect with a smoke flue, 301

not shown, and a smaller opening 2l in its bottom forming an air vent. Disposed above the opening 25 is akbale 28 having anupwardly and forwardly extending oblique portion terminating in a horizontal portion at its free end to g5: direct fumes and the products of combustion which enter the draft passage 24 toward the front thereof. Behind the baille 28 is a damper 29 which is pivotally mounted intermediate of its ends and which is provided with an arml 3l! be disposed obliquely to the plane thereof. A flap valve 3| is pivotally connected at 32 to control the opening 21 and is likewise provided with an arm 33 disposed obliquely thereto and connectedv to the free end of the arm 3D by means of the' 45' rod 34 which extends through a slot 34 in the damper 29. An angular shaped arm 35 is secured to and depends from the underside of the valve 3l with its free end disposed substantially parallel to the plane of lsaid valve: Mounted on 50; said parallel portion is a counterbalance 36 pro-v vided with a set screw for adjustably positioning it. The parallel portion of the arrn 35 extends inwardly toward the casing Il so that by moving the counterbalance 36 outwardly 55;

PATENT 'OFFICE 1 passing through the space 22.

relatively thereto the downward pressure on valve 3| will be increased to urge it toward a closed position. As seen in Figure 1, damper 2S and valve 3| are so connected by means of the rod 34 that as the valve 3| closes the damper 29 will be opened and conversely, in order to control the draft through the draft jack 24.

A plurality of burners 31 are disposed beneath the casing I6, in the space 2|, between and in spaced relationship to the inlet pipes |1, each of said burners being provided with a manually controlled valve 38 adapted to be disposed adjacent the openings 39 in the lower part of the outer casing Il for selectively controlling and adjusting the burners 31. Burners 31 are all connected to a common supply pipe 40 which connects with a storage tank 3| mounted behind the heater I0. Disposed in the pipe line 4U is the T-joint, designated generally 4| the two arms 42 and 43 of which form a part of the pipe line 40, said arms being connected to the pipes 44 by means of conventional socket nuts 45 to form a liquid tight connection. Connected to the third, upwardly extending branch 46 of the joint 4|, by means of the nut 41 is the free end of the pipe 48 which forms a part of the casing 49 which lis provided with the openings 50. A thermostat of any conventional construction, is mounted in the casing 49 and adjustably supported therein by means of the set screw 52 which extends through the top thereof. Thermostat 5| isprovided with a depending needle valve 53 which is loosely disposed in the bore of t'he pipe 48 and of the branch 46, and which is provided with a tapered end 53 adapted to seat in the tapered portion 54 of the bore of the branch 42 to close or partially close the pipe line 40.

From the foregoing it will be seen, that the burners 31 will receive fuel through the pipe line 40 to heat the pipes |1 and the bottom of the casing I6. The air will be drawn inwardly through the openings I3 and upwardly through the pipes I1 into the casing I6 being heated during this passage. The products of combustion, from the burners 31 will pass upwardly through the passages 2! by a circuitous route around the casing |6 to heat the sides thereof to increase the heat of the air therein, said products of combustion passing through opening 25 into the draft passage 24 and out through the opening 26 to the smoke flue. The heated air in the chamber IB will pass upwardly therefrom through the passages |8 into the headers 55 in the dome l5, which are heated by the products of combustion Headersl 55 are provided with one or more outlets 56, which may open outwardly into a room or which may connect with pipes leading to a plurality of rooms to release or carry 01T the heated air. The thermostat 5| is disposed adjacent to the outer casing and is responsive to the heat thereof to be expanded as the heat increases to move the needle valve 53 downwardly to decrease the opening between its end 53 and the tapered valve seat 54 to decrease the amount of fuel permitted to pass through the supply pipe 40. The valve portion 53 and the valve seat 54 are so arranged, that when the Valve is in a fully closed position a slight amount of fuel may still pass therethrough, said amount being sufficient to merely keep the burners 31 lighted.

Various modifications and changes in the co-nstruction and arrangement of the parts forming the invention may obviously be made and are.

contemplated, as the drawings and description are only intended to illustrate a preferred cmbodiment thereof, and the right is therefore reserved to make such variations and changes as fall within the spirit and scope of the invention as hereinafter defined by the appended claims.

I claim as my invention:

1. A device of the class described comprising an outer casing, an inner casing disposed in spaced relationship to said outer casing and provided with depending conduits, continuous ascending vanes disposed between said casings and forming ascending passages, said outerk casing being provided with a horizontal partition above said inner casing having a substantially centrally disposed opening, the top of said outer casing forming a head having a central compartment communicating with said opening and with a smoke flue, passages connecting said inner casing, at 'its top, with the remaining portion of said head, said remaining portion being provided with outlet openings, and burners mounted in said outer casing beneath said inner casing and above the lower ends of said depending conduits to heat the conduits and the bottom of said inner casing directly, the products of combustion passing upwardly from said burners through said ascending passages to heat the sides and top of said inner casing, and the air in said inner casing passing upwardly through the passages at its top into said head toI be exhausted outwardly therefrom.

2. In a device of the class described, a heater comprising inner and outer casings disposed in spaced relationship relatively to each other, ascending vanes disposed between said casings forming a plurality of ascending passages, burners disposed beneath said inner casing and within said outer casing, conduits depending from said inner casing and opening beneath said burners to convey air upwardly throughthe inner casing to be heated by said burners, said outer casing being provided with a dome disposed above and in spaced relationship to said inner casing and having a centrally disposed draft passage communicating with said ascending passages and with a smoke flue, and. a plurality of passages connecting said dome and inner casing.

3. A device as in claim 2, said draft passage being provided with ya damper, 4an -air valve mounted in said draft passage and provided with an adjustable counterbalance, and means connecting said damper and Valve for adjustably and automatically controlling the draft to said smoke flue.

4. A hot air furnace comprising an outer casing having openings adjacent its bottom to admit air, an inner casing mounted in the outer casing, ascending vanes mounted between said casingsl and forming a plurality of circuitous ascending passages, tubes depending from the inner casing and opening adjacent the bottom of the outer casing, a plurality of burners disposed beneath the inner casing and above the lower ends of said tubes, said outer casing having a horizontal partition disposed above and spaced from the inner casing and forming a dome, partitions dividing said dome into a plurality of compartments including a center smoke passage having an opening in its bottom connecting with the space above the inner casing forreceiving the products of combustion therefrom, a baflie for directing the products toward one end of said passage, an outlet in the opposite end thereof, -an adjustable automatically controlled damper Cil mounted in the passage between the baffle and outlet, said other compartments being heated by said passage, said last mentioned compartments being provided with outlets and with passages connecting with the inner casing.

5. A hot air furnace comprising an outer casing having a dome at its top, an inner casing spaced from the outer casing `and dome, a burner disposed beneath the inner Casing, tubes depending from the inner casing and opening beneath the burner, ascending Vanes connecting the side Walls of the casings and forming ascending passages, said dome having an opening communi-I cating with the space above the inner casing, a smoke passage in said dome communicating With said opening, a smoke stack rising from said smoke passage, a damper disposed between said opening and smoke stack, and tubular conduits connecting the top of the inner casing and said dome, said dome having outlets; for the heated air yfrom the inner'casing.

PAUL R. MCNAMAR.v

CII 

